﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            int i = 0; 
            if(i< 10)
            {
                MessageBox.Show(i.ToString());
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int i = 0; int j = 200;
            for(; i < 100&&j<250; i++,j--)
            {
                richTextBox1.AppendText(j.ToString() + "\r\n");
                Thread.Sleep(10);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MessageBox.Show((sender as Button).Text);
        }
    }
}
